Research On Key Techniques Of Interactive Virtual Assembly Platform

With the development of science and technology, the traditional assembly method is gradually replaced by the virtual assembly technology because of its low efficiency,unreasonable and so on. Virtual assembly has the advantages of short development cycle,high assembly efficiency, material saving and so on. Therefore, in the future assembly process, it is necessary to build a virtual reality platform, the key technology of the virtual reality platform research will be indispensable. Based on the analysis of the assembly sequence and assembly path, this paper studies the key technology of the core component of the engine。The construction of the virtual assembly platform of the engine can make us have a more profound understanding of the process of virtual assembly.First, we built the virtual assembly environment. Choose many models structure of assembly model and the hierarchical model for the parts. The hierarchical model and the mixed model are put forward, which is a good model for the parts. Using modeling software Solidworks2007 to establish a complete set of four cylinder engine model and form the intermediate format of the assembly file, increase the general of the model. Then use the rendering optimization technology in 3dsMax2013 to make the model to complete the map rendering and detail optimization, make the virtual environment more realistic. In EON, the level of the model tree is optimized, and completed the virtual environment of the engine.Secondly, study the assembly sequence and assembly path of the engine. Using Petri net planning the model assembly sequence, establish the Petri net assembly model and analysis the assembly sequence of Petri net, with incidence matrix and state equation obtained reasonable engine crank connecting rod mechanism assembly sequence. Based on the assembly sequence, using EON virtual reality technology and real-time collision detection technology, record the path key point, design and plan the assembly process of the virtual assembly process.Thirdly, the real time collision detection algorithm in the process of virtual assembly is studied and simulated. Use four bounding box as an example, by comparing the collision detection algorithm of the advantages and disadvantages, comparative analysis the real-time and the detection efficiency, determine the efficiency and real-time collision detection algorithm, choice k-DOP bounding box in the EON Studio, to ensure that the model is able to in the assembly system timely and accurately to avoid collisions between the parts model, make the virtual scene more realistic.Finally, complete the assembly of the engine model and establish the virtual realityplatform in the virtual environment. According to the design of the assembly process for the engine to implement assembly, verify the feasibility of the assembly process. At the same time, combined eon with VB program to design interactive virtual assembly platform,including virtual environment construction、EONX controls add、 information exchange between VB and EONX、assembly process simulation. Finally realizes the virtual assembly of the engine crank connecting rod mechanism, completed the construction of virtual assembly platform.